Long‐term effects of annual applications of N and S fertilizers to grassland on forage yield,root mass,and soil pH,organic C and N on a Dark Gray Chernozem in north‐central Saskatchewan

摘要

Many soils in the Parkland region of Prairie Provinces of Canada contain insufficient amounts of both plant‐ available N and S for high crop yields.Application of N and/or S fertilizers on grasslands can acidify soil or alter some other soil properties, but also improve soil quality (Malhi et al.1991).The objective of this study was to determine the effects of long‐ term N, S and/or K fertilization on forage dry matter yield (DMY), root mass, plant species composition, and soil pH, total organic C (TOC) and N (TON), and light fraction organic C (LFOC) and N (LFON).